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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Senior secured debt $ 22,167 $ 20,709
Net debt issuance costs (258) (239)
Total debt (average life of 8.8 years, rates averaging 4.7%) 34,861 33,722
Less amounts due within one year 162 145
Long-term debt 34,699 33,577
Senior Secured Asset-Based Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term line of credit 3,750 2,480
Senior secured 364-day term loan facility [Member]    
Debt Instrument [Line Items]    
Senior secured debt 0 0
Senior Secured Term Loan Facilities [Member]    
Debt Instrument [Line Items]    
Senior secured debt 3,711 3,725
Senior Secured Notes [Member]    
Debt Instrument [Line Items]    
Senior secured debt 13,850 13,850
Other Senior Secured Debt [Member]    
Debt Instrument [Line Items]    
Other senior secured debt 686 654
Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Senior unsecured notes 12,952 $ 13,252
Senior Secured Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term line of credit $ 170